Westermo MRD-3x0 - Manual (Page 175)

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7.6.2 Selecting the port function
The serial server configuration is accessed by selecting Serial
Server from the main menu and Port Setup from the submenu.
To enable a port for the DNP3 IP-Serial Gateway function,
select DNP3 IP-Serial Gateway from the Function column of
the appropriate port. Once selected, click Update to confirm
the change. Once confirmed, the port will display as shown in
Figure 125.
Figure:125: Selecting DNP3 Gateway function